Spark-plug.



W. s. WITTBR.

SPARK PLUG. APPLICATION IILED OUT. 6, 1910.

1,008,935, I I Patented Nov. 14, 1911. Q

7 IIIVI/FIVTOI? 4 WITNESSES:

' MAL/HM 5/1477??? shown, a case 1 is provided of suitable mate-i acitizen of the United an sra'rns rgrnnr orrion? WILLIAM s. written, oraULEsBunacoLoRAno.

simian-PLUG.

2 Specification of Letters Patent.

Pat

nted ov. .14, 1911.

To all'wno m it m'y concern:

- Be it known that I, WILLIAM S. Wrrrnn, States, residing at Julesburg,in the county of Sedgwick and State of Colorado, have invented a new anduseful Improvement in Spark-Plugs, of which the following isaspecification.

' My invention is an improvement in spark plugs, and consists'in certainnovel constructions, and combinations of parts, hereinafter describedand claimed.

Referring to the drawings forming a part hereof, Figure 1 is a side viewof the improved plug. Fig. 2 is a vertical section.

3 is a plan view of the plug with the cover removed, and Fig. 4. is adiagrammatic partial side view.-

In the embodiment of. the invention rial, andcylindrical in form, andthe.upper end of the case is threaded externally at 2,

to receive an internally threaded cap 3, having a corrugated annular-rib4, for convenie'nce in removing or replacing the cap.

A supporting tube 5, is provided with an enlargement 6 at one end, anannular shoulder? being formed between the main portion and the enlargedportion, and the tube is-arranged axially of the case, with the shoulder7'. abutting the outer face of the lower--end of the said case. Thelower end of the enlargement is reduced'rand threaded l The upper end ofthe insulating tu at 8 to engage a threaded opening in the cylinder.That portion of the supporting tube withinthe case is encircled by abobbin 9, upon which is wound the wire in the usual manner, and aninsulating tube 10 is arranged within the supporting tube. A steel shellor sleeve ll'is arranged with the insulating tube, and forms a bearingsleeve or shell for the sparking pin 12.

The lower end of the pin 12 is enlarged to form a head 13, and the upperend extends above the shell 11 and is threaded at $5.

or base '5 extends above the bobbin'and is threaded .at 15, and isengaged by a'nut 16,

14. The upper end of the supporting tube the nut holding the bobbin inplace against the lower end of the case.

is reduced or beveled at 17, and the upper end of the supporting tube orbase is en- 1 larged internally at 18 to fit the bevel. A

nut 19 is threaded on to the portion 14 of theipin, and the armature 2Oencircles the piuabove the nut, and is held in place by a second nut 21,the armature having an open ing 22 for receiving the pin.

The terminals 23 and 24 of the wire on the bobbin pass from the bobbinupwardly through a passage 25 in a fiber support 26 secured in the caseby screws 27. A spring 28 is secured to the fiber support by screws 29,and the free end of the spring extends radially inward into position forengagement by the lower end of a contact bolt 30.

A rope 31 composed of a plurality of fine wires twisted together, isconnected'at one end by means of a threaded clamping cap 32 with; a lug33 on the armature, and the opposite end ofthe rope is provided with aring 34, to which the terminal 23 is connected. The terminal 24 isconnected to the spring 28, by means of a screw 35. 2

The upper end of the bolt is threaded at 36, and extends through anopening 37 in the cap. The opening is of greater diameter than the bolt,and a bushing 38 of fiber or other insulating material is arrangedbetween the bolt and the edge of the opening. The bolt is provided withan annular rib 39, spaced apart from its lower end, and the said ribabuts against the lower end of the bushing. An insulating washer 40encircles the bolt and engages the upper face of the cap and the upperend of the bushing, and the bushing is provided with an annula'r rib 41for engaging the under face of the 1 cap The bolt is thus insulated fromthe cap and a nut 42 is threaded on the bolt above the washer. The heador annular rib 13 of the contact pin forms one of the terminals of theplug, and a lug'43 forms the other, the lower end of the lugextendingbelow the support orbase 6 ofthe plug.

'VVhen the plug is placed on the cylinder, the lug 43 is-groundedthrough the support to the cylinder, in the usual manner. A thumb nut 44is threaded onto the contact bolt, and the usual ring on the flexibleconductor from the magneto is arranged on the bolt between the nut 42and the thumb nut 44. A magnet 45 roughly of horse shoe shape isarranged with the chamber 46 formed between the inner face of the capand the upper end of the bobbin. The armature as shown more clearly inFig. 3 is circular in form, and the outer edge thereof is directly abovethemagnet, and spaced apart slightly therefrom. The support 26 isarranged between the ends of the magnet (Fig.

4). and the sparln'ng pin is moved longitudb nally in one directionbyjgthe attraction of the magnet exerted on the armature. The

rib or enlargement 18'at the upper end of the supporting tube, preventsthe insulation blowingout.

- of the said pin. Thefhead 13 of the pin is extended laterally at 47,towardthe'lug 43,

'to contact therewith when moved outwardly.

The circuit is thus completed, from the magneto through bolt 30, spring28 and terminal: on the bobbin, through- 24to the Windin the same to teral 23, armature 20, pin

12, lug 43, supporting tuba -and engine to ground, energizing the magnet45.- ,The magnet attracts the armature forcibly, moving the pindownwardly'and'breaking the circuit, producing a fat hot spark. It willbe evident that the improved plug consists of a case provided with meansfor engaging an engine cylinder and having a plunger acted upon by thecompression and moved in one direction thereby, and in the oppositedirection by alsolenoid coil of which the plunger formsthe'case. I

-I claim i y A spark plug comprising a supporting extending through theopening magnet tube; of conducting material having means for engaging anengine cylinder, a solenoid encircling the tube and supported thereby, acore of, conducting material reciprocable .in the tube, saidv corehaving a head at the end of the tube adjacent to the cylinder to beacted upon by the compression in the cylinder to move the coreoutwardly, the tube having a-pin cooperating'with the head to form aspark gap, an insulating tube-within v the supportingtube, an armaturesecuredto the core at the opposite end from the head and upon which thesolenoid/acts to move the core inwardly to break the circuit through thesolenoid, means 'for connecting the plug with a source of electricalenergy, said means comprisin'g'a casing for the tube having an openingat its-outer end, a bolt:

said bolt having means outside of thejcasing for connection with thesource of energy, and having a head within the casing, a block ofinsulating material adjacent to the bolt, a

sprmgconnected with thebleck and engaging the head of the bolt-,.. d'aconnection between the spring and the'solenoid,

' s. WITT ER. Witnesses:

J. G. CAvEiqDEn,

F. H. KLUCKMAN.

